1. How are chemical reactions classified?
Type of Reactions
How are chemical reactions classified?
How do we identify each type of reaction?

2. BALANCING REACTIONS

4. Types of Reactions Synthesis Decomposition Single Replacement
Double Replacement

5. Decomposition GENERAL FORMULA AX è A + X 2H2O è 2H2 + O2
An input of energy causes one substance to break up (decompose) into smaller pieces
GENERAL FORMULA
Compound è two or more substance
AX è A + X
example
2H2O è 2H O2
example

6. Decomposition C6H12O6(s) C(s) + H2O (g) 2 2 6 6
H2O2 (aq) H2O (g) + O2(g)
C6H12O6(s) C(s) + H2O (g) 2 2 6 6

7. DECOMPOSTION

8. Synthesis GENERAL FORMULA A + X è AX 2H2 + O2 è 2H2O
Reaction in which two substances combine to form one substance
GENERAL FORMULA
two or more substance è Compound
A + X è AX
example
2H2 + O2 è 2H2O
example

9. Synthesis or Combination
Fe(s) + O2(g) FeO(s)
2Na(s) + Cl2(g) 2NaCl(s)
SO3(g) + H2O(l) H2SO4(aq) 2 2

10. SYNTHESIS

11. Single Replacement GENERAL FORMULA A + BX è AX + B (cation)
Reaction in which one element takes the place of another in a compound
GENERAL FORMULA
Element + Compound è Compound + Element
A + BX è AX + B (cation)
Y + CZ è CY + Z (anion)
example
Zn + 2HCl è ZnCl2 + H2
example

13. Single Replacement CuO(s) + H2(g) H2O (l) + Cu (s)
Al(s) CuCl2(aq) AlCl3(aq) + Cu(s)
silver Blue clear copper 2 3 2 3

14. SINGLE REPLACEMENT

15. Double Replacement AY + BX è AX + BY
The anion and cations of two compounds are interchanged
GENERAL FORMULA
Compound + Compound è Compound + Compound
AY + BX è AX + BY
example
Cu3(PO4)2 + Na2S èNa3PO4 + CuS

16. Double-Replacement CuNO3(aq) + KI(aq) CuI(s) + KNO3(aq)
3Na(OH)(aq) + PbCl2 (aq) 2NaCl(aq) + Pb(OH)2(s)

17. DOUBLE REPLACLEMENT

19. Combustion reaction
2CH4 + 4O2 
2CO2 + 4H2O

20. Combustion reaction
Reaction in which an organic compound and oxygen burn.
Oxygen always is a reactant
CO2 and H2O will always be a product

21. Summary of Reaction Types

22. IDENTIFY the TYPE

23. Na3(PO4) + CaCl2 = Ca3(PO4)2 + NaCl
Zn + Pb(NO3)2 = Zn(NO3)2 + Pb
AlBr3 + Cl2 = AlCl3 + Br
Na3(PO4) + CaCl2 = Ca3(PO4)2 + NaCl
K (ClO3) = KCl + O2
Al + HCl = AlCl3 + H2
Ca (OH)2 + H3(PO4) = Ca3(PO4)2 + H2O
Cu + H2(SO4) = Cu (SO4) + H2O + SO2
H2 + NO = H2O + N2